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(cba:news) V1674 Her... once more with feeling! (Joe Patterson) [2022-04-08T10:53:24Z]




Hi CBAers,

A recent ATel suggests that V1674 Her has "returned to quiescence". I'm not sure exactly what the authors meant by this... maybe simply that the spectrum now resembles a CV rather than a nova. But all of our data shows that it's still 3 magnitudes above quiescence, and exhibiting the same periodic phenomena which characterized the eruptive state (3.5 hours and 8 minutes). In particular, the pulsation period continues to speed up, as it did throughout 2021.

There's a lot of physics in that change of pulse period. And it's all NEW physics. Never before have we had a star with known pulse period *before* eruption, known pulse period ~10 days after eruption, and then continuously known dP/dt for the next 300 days (and counting).

Maybe when we have 10 TESSs and ZTFs, such things will be routine. But it's all terra incognita now, and I earnestly hope you guys keep the time series coming! It gets 4 minutes better every day... but even now, Hercules is well up in the morning sky.

We are just getting started on this amazing star... and I bet others are, too. In the history of novae, I think it will take a high place in the pantheon, alongside DQ Her, T Pyx, and V1500 Cyg.

joe

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